Abstract

In classical particle mechanics, it is well understood that while
working with nonholonomic and nonideal constraints, one cannot
expect that the constraint be workless. It is curious that in
continuum mechanics, however, the implications of the result in
classical mechanics have not been clearly understood. In this paper,
we show that in dealing with the response of dissipative systems,
one cannot require that constraints do no work or ignore the fact
that the material response functions depend on the constraint
reaction. An example of this is the viscosity of a fluid depending
on the pressure.